Update: The Netherlands’ foreign minister was facing a tough debate in Parliament Tuesday following his admission that he lied about attending a meeting hosted by Russian President Vladimir Putin at his country retreat more than a decade ago.

He called it “by far the biggest mistake of my political life, the Netherlands deserves a foreign minister who is beyond any doubt.”

As FD.nl reports, on Monday, the coalition seemed to want to support Zijlstra. But that became difficult when the Volkskrant reported that Zijlstra not only lied about the source of Putin’s message – not he, but then Shell CEO Jeroen van der Veer was present at the meeting – but that Zijlstra also misunderstood the content of the message interpreted.

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In a shocking admission, Dutch Foreign Minister Halbe Zijlstra said he lied when he claimed to have heard President Vladimir Putin describing an ambition to unify Russia, Ukraine, Belarus, the Baltic states and Kazakhstan into a single super-state to rival the influence of the former Soviet Union.

Zijlstra claimed at a party conference in 2016 that he had overheard Putin outlining the grand plan for a “Greater Russia” in 2006 during a gathering of businessmen. At the time, Zijlstra was working at Shell, RT reports.

In the original retelling of the story,Zijlstra said he had been in a back room of a dacha (country house) when he heard Putin define “Great Russia” as “Russia, Belarus, Ukraine and the Baltic states,” adding that “Kazakhstan was nice to have.”

The story was questioned by the newspaper Volkskrant, however, which quickly discovered that Zijlstra had not even attended the 2006 business meeting in Russia, despite being part of the Shell delegation. When confronted about this, the minister acknowledged that he had lied, and said he was simply trying to protect a source.

“I made the decision that this is an important geopolitical story with serious implications,” he said.

“I put myself in the story to make sure that the revelations weren’t about the person who was actually there. Because that could have had implications for him or his company.”

Zijlstra insisted he was told as much from a source whom he refused to name. The newspaper itself says the source was Jeroen van der Veer, who was the CEO of Shell at the time.

The revelation comes at an awkward time for the foreign minister. Zijlstra, who took office in October 2017, is set to visit Moscow this week to meet with his Russian counterpart, Sergey Lavrov. Geert Wilders’ opposition right-wing Party for Freedom has called for a parliamentary debate about Zijlstra’s integrity before he leaves. Zijlstra told Volkskrant that he informed Prime Minister Mark Rutte about his conduct several weeks ago.

“Greater Russia” is an amorphous term usually used to describe the historic core of the Russian state, roughly corresponding to the territory of medieval Russia in the 16th century – the beginning of the reign of Ivan the Terrible, who was the first of Russia’s great expansionist rulers. The word “greater” is meant as a description of spiritual significance rather than physical size. The same term was applied to the core territories of some other countries, like Greater Armenia, Greater Walachia or Greater Poland.